Guard Charm is a talisman you take through three ranks, ending at Iron Skin Lv3. The first rank costs 500z to craft, every rank after that is an upgrade. Some of the materials only come from Balahara, Doshaguma and Guardian Doshaguma.
Rank by rank
Guard Charm IRarity 3
Iron Skin Lv1: Reduces the duration of defense down by 50%.
Craftable · 500zGuard Charm IIRarity 5
Iron Skin Lv2: Reduces the duration of defense down by 75%.
Upgrade from previous rank · 3,000zGuard Charm IIIRarity 6
Iron Skin Lv3: Prevents defense down.
Upgrade from previous rank · 6,000z